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Copper tolerance of Saccharomyces cerevisiae nonsense-mediated mRNA decay mutants

Rafael Deliz-Aguirre1, Audrey L Atkin, Bessie W Kebaara

  • 1Department of Biology, Baylor University, Waco, TX 76798-7388, USA.

Current Genetics
|September 16, 2011
PubMed

Insights

Nonsense-mediated mRNA decay (NMD) regulates yeast copper transporter CTR2 expression. NMD degrades longer CTR2 mRNA variants, impacting copper tolerance in yeast cells lacking NMD.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Eukaryotic Gene Expression

Background:

  • Nonsense-mediated mRNA decay (NMD) is a crucial surveillance pathway in eukaryotes.
  • NMD degrades mRNAs with premature termination codons and some natural mRNAs with long 3'-untranslated regions (UTRs).
  • Alternative 3'-end processing in Saccharomyces cerevisiae can produce mRNA isoforms with varying 3'-UTR lengths, potentially targeting them for NMD.

Purpose of the Study:

  • To investigate the role of NMD in regulating the expression of the CTR2 gene, which encodes a vacuolar membrane copper transporter.
  • To determine how NMD affects different CTR2 mRNA isoforms generated by alternative 3'-end processing.

Main Methods:

  • Analysis of CTR2 mRNA isoforms with different 3'-UTR lengths (300-nt and 2-kb).
  • Comparison of copper tolerance in wild-type yeast and nmd mutants.
  • Assessment of CTR2 gene's role in the copper tolerance of nmd mutants.

Main Results:

  • Both CTR2 mRNA isoforms are differentially regulated by the NMD pathway.
  • Yeast cells with mutations in NMD (nmd mutants) exhibit increased tolerance to toxic copper levels compared to wild-type cells.
  • The enhanced copper tolerance observed in nmd mutants is dependent on the presence of the CTR2 gene.

Conclusions:

  • NMD plays a significant role in regulating CTR2 gene expression through differential degradation of its mRNA isoforms.
  • The regulation of CTR2 by NMD has direct physiological consequences on cellular copper tolerance in yeast.
  • Targeting NMD or its downstream effectors could be a strategy for managing copper toxicity in yeast.

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